6. Must be experiencing symptoms of overactive bladder according to the ICS definition of a minimum voiding 8 or more times/24 hours and a daily average of at least 1 episode of urgency and/or urinary incontinence (urge incontinence predominately as measured by 3IQ diary) per 24 hours during a 3-day micturition diary period. Patients must have documentation of OAB within the last 6 months.